134 HYMENOPTERA. 



variable, but all having dark collars, and usually more re- 

 stricted yellow markings on legs and thorax. These I have 

 designated " var. subtristis y 



Of the females thirteen specimens from Colorado and 

 California agree in general with the description of the typical 

 form, except that they vary considerably in size, while about 

 thirty specimens, mainly from Nevada have almost no yellow 

 on legs or thorax, and very reduced face marks, and have no 

 yellow on the collar. These, corresponding to the dark male 

 form, are designated "var. siibiristisy They are exceed- 

 ingly variable in size, form and markings, as well as punc- 

 turation of abdomen, some having almost no punctures ex- 

 cept on second or third segments and very few here. The 

 varietal name is taken from the form of which the female 

 was described by Swenk and Cockerell as P. subtristis (Ent. 

 News. 21 : 70). I have a paratype of this from Mr. Swenk, 

 which is identical with the series of Nevada specimens, being 

 merely one of those with the almost impunctate abdomens. 

 The most extreme of these specimens cannot be distinguished 

 from females of P. variirons, Cr. This group of females, 

 like that including modestiis, and zizice, or that containing 

 coloradensis, wootoni, etc., is very homogeneous and variable, 

 and only typical specimens can be determined with certainty. 



The variety coquillettii is based upon the description of 

 P. cogjiillettri Ckll., (Psyche. 7:439), and upon two male 

 specimens from Texas agreeing with this description. Cock- 

 erell's specimen was from California, but none of my speci- 

 mens from this region correspond to it. The two males 

 from Texas, however, are certainly identical with it if the 

 description is accurate. They are easily recognized as a 

 variety, but have no characters to warrant their separation 

 as a species, being inerely a better pigmented form such as 

 may be found in southern groups of many species. The 

 description of the female of this variety is based upon two 

 specimens from the same place as the males. I have pro- 

 visionally put them here, altho they could be equally well 

 put with the viodestns group, on account of their small size 

 and almost impunctate abdomen. 



